CA2021828A1 - Display system with graphics cursor - Google Patents

Display system with graphics cursor

Info

Publication number
CA2021828A1
CA2021828A1 CA2021828A CA2021828A CA2021828A1 CA 2021828 A1 CA2021828 A1 CA 2021828A1 CA 2021828 A CA2021828 A CA 2021828A CA 2021828 A CA2021828 A CA 2021828A CA 2021828 A1 CA2021828 A1 CA 2021828A1
Authority
CA
Canada
Prior art keywords
cursor
cache
graphics
data rate
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2021828A
Other languages
French (fr)
Other versions
CA2021828C (en
Inventor
David Christopher Haigh
Roy Bernard Harrison
Helen Rosalind Bonnor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of CA2021828A1 publication Critical patent/CA2021828A1/en
Application granted granted Critical
Publication of CA2021828C publication Critical patent/CA2021828C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/08—Cursor circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/12—Frame memory handling
    • G09G2360/121—Frame memory handling using a cache memory

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Digital Computer Display Output (AREA)

Abstract

A display system has cursor definition memory for storing data defining a graphics cursor, a cache for the temporary storage of a portion of the graphics cursor for display on a display device, the cache being such that its data rate is sufficient to support the display of the graphics cursor, and control logic for updating the cache from the cursor definition memory at a slower data rate.
The cache need only be large enough to store a portion of the cursor at any one time as the graphics cursor is only displayed for a fraction, for example one-tenth, of a scan line and the cache can be updated during the portion of the scan time when the cursor is not displayed.
Through the use of a small cache operable at the required data rate, inexpensive memory which does not support the required data rate can be used for the cursor definition memory.
CA002021828A 1989-10-12 1990-07-24 Display system with graphics cursor Expired - Fee Related CA2021828C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89310460A EP0422300B1 (en) 1989-10-12 1989-10-12 Display system with graphics cursor
EP89310460.4 1989-12-10

Publications (2)

Publication Number Publication Date
CA2021828A1 true CA2021828A1 (en) 1991-04-13
CA2021828C CA2021828C (en) 1995-10-10

Family

ID=8202816

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002021828A Expired - Fee Related CA2021828C (en) 1989-10-12 1990-07-24 Display system with graphics cursor

Country Status (5)

Country Link
US (1) US5376949A (en)
EP (1) EP0422300B1 (en)
JP (1) JPH03132793A (en)
CA (1) CA2021828C (en)
DE (1) DE68920148T2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015528A1 (en) * 1993-11-30 1995-06-08 Vlsi Technology, Inc. A reallocatable memory subsystem enabling transparent transfer of memory function during upgrade
US5859649A (en) * 1995-05-15 1999-01-12 Motorola, Inc. Data processing system having display controller with bursting direct memory access
US5686938A (en) * 1995-06-29 1997-11-11 Batkhan; Leonid Z. Adaptive cursor control system
US6064405A (en) * 1998-04-10 2000-05-16 Ati Technologies, Inc Method and apparatus for a cached video hardware cursor
US6965369B2 (en) * 2002-02-11 2005-11-15 Microsoft Corporation Method and apparatus for smoothing cursor movement in relation to a refresh rate of a display
CN101004904B (en) * 2006-01-20 2010-06-02 深圳迈瑞生物医疗电子股份有限公司 Device for accelerative displaying cursor

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911419A (en) * 1973-11-23 1975-10-07 Xerox Corp Controller for cursor positioning on a display medium
JPS5827509B2 (en) * 1975-12-26 1983-06-09 株式会社日立製作所 Cursor movement control device in screen split control device
NL179417C (en) * 1976-06-22 1986-09-01 Hollandse Signaalapparaten Bv BRIGHTNESS CONTROL DEVICE FOR DISPLAYING VIDEO SIGNALS ON A GRID SCAN DISPLAY.
DE2939458A1 (en) * 1979-09-28 1981-05-21 Siemens Ag SYSTEM FOR LOCALIZING AREAS WITH MIXED TEXT / IMAGE EDITING ON THE SCREEN
US4467322A (en) * 1982-08-30 1984-08-21 Sperry Corporation Digital shade control for color CRT background and cursors
DE3370706D1 (en) * 1983-12-22 1987-05-07 Ibm Raster-scanned cathode ray tube display with cross-hair cursor
JPS61213892A (en) * 1985-03-19 1986-09-22 株式会社アスキ− Display controller
GB8612930D0 (en) * 1986-05-28 1986-07-02 Int Computers Ltd Video display system
JPS6436327A (en) * 1987-07-31 1989-02-07 Hitachi Ltd Optical printer controller
CA1317041C (en) * 1987-12-24 1993-04-27 Ncr Corporation Apparatus for creating a cursor pattern by strips related to individual scan lines
US4891631A (en) * 1988-01-11 1990-01-02 Eastman Kodak Company Graphics display system

Also Published As

Publication number Publication date
DE68920148T2 (en) 1995-06-29
EP0422300A1 (en) 1991-04-17
DE68920148D1 (en) 1995-02-02
CA2021828C (en) 1995-10-10
JPH03132793A (en) 1991-06-06
EP0422300B1 (en) 1994-12-21
US5376949A (en) 1994-12-27

Similar Documents

Publication Publication Date Title
EP0240410A3 (en) Pixel processor
EP0368117A3 (en) Display system
KR910003559A (en) Flat Panel Display Indication Control with Dual Port Memory
ATE164019T1 (en) DISPLAY CONTROL DEVICE
CA2021828A1 (en) Display system with graphics cursor
EP0312720A3 (en) Double buffered graphics design system
AU3483393A (en) Video graphics controller with improved pattern capabilities
EP0080043A3 (en) Method for data storage in an image refresh memory of a vdu
JPS57114962A (en) Diagram managing system
JPS5556240A (en) Crt display unit
JPS6413191A (en) Image display device for sample
JPS5543685A (en) High-speed writing system
JPS52117029A (en) Display control in x-y dot matrix type display unit
EP0283579A3 (en) Raster scan display system with random access memory character generator
JPS6488587A (en) Display controller
JPS647225A (en) Window re-displaying system
CA2021827A1 (en) Display system
JPS55108072A (en) Processing system for real time animation
CA2012406A1 (en) Graphics system
JPS55108048A (en) Buffer memory access system for display
JPS6468789A (en) Display image switching apparatus
JPS57120863A (en) Waveform moving system of waveform storage device
JPS55115135A (en) Graphic display system
JPS6457330A (en) Multiwindow display system
JPS6424295A (en) Display control system

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed